Recipe

Peanut Butter Rice Krispie Treats

Soft, gooey cereal squares with peanut butter in the marshmallow mix, plus a separate classic butter-only recipe.

By Pip

•

4.8

A stack of gooey peanut butter Rice Krispie treats on a white plate on a cozy kitchen table, with a few cereal bits scattered nearby

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Pull up a chair. Let’s take this recipe one clear step at a time.

These peanut butter Rice Krispie treats are extra gooey, a little salty-sweet, and wonderfully soft. The trick is simple: we replace part of the butter with peanut butter in the marshmallow mixture. You get that cozy peanut butter flavor without ending up with heavy or crumbly squares.

And because some days you want the classic version, I included a separate butter-only recipe too. Same easy method, just a different flavor path.

Rice Krispies cereal, mini marshmallows, butter, and creamy peanut butter arranged on a light kitchen counter in small bowls

Why It Works

Gooey texture, every time: Use 1/3 cup creamy peanut butter with low heat and a gentle stir, and you will get soft squares that stay tender.
Do not overwork the mix: Once the marshmallows melt, turn off the heat and fold quickly. Extra heat and extra stirring are what turn treats chewy.
Thick squares made simple: An 8 x 8 inch pan gives that bakery-style thickness without changing a thing.
Storage matters: Keep them airtight at room temperature so they stay soft and gooey.

Pairs Well With

Storage Tips

Best way to keep them soft: Store tightly covered at room temperature. Air is the enemy of gooey treats.

Counter: Keep in an airtight container for 2 to 3 days. Place parchment or wax paper between layers.
Extra softness tip: Add a slice of sandwich bread to the container (not touching the treats if you can help it). The bread goes stale and the treats stay softer.
Fridge: Not my first choice because it firms them up, but it works for up to 5 days. Let squares sit at room temperature 20 to 30 minutes before serving.
Freezer: Wrap individual squares in plastic wrap, then place in a freezer bag for up to 6 weeks. Thaw at room temperature, still wrapped, so they do not dry out.

Peanut butter Rice Krispie treat squares stacked in an airtight container lined with parchment paper on a kitchen counter

Common Questions

Can I use crunchy peanut butter?

You can, but the treats press and slice a little less cleanly. If you want crunch, I usually recommend keeping the peanut butter creamy and stirring in 2 to 3 tablespoons chopped peanuts at the end so the texture is more predictable.

Do I have to use regular peanut butter?

For the easiest, most consistent set, I recommend a conventional creamy peanut butter (like the kind that stays smooth in the jar). Natural peanut butter can separate and make the mixture a little looser or oily. If that is what you have, stir it very well first and expect the bars to set a touch differently.

How much peanut butter should I add?

For a standard batch in an 8 x 8 inch pan, 1/3 cup creamy peanut butter is the sweet spot. It gives strong peanut butter flavor while staying soft. If you push it to 1/2 cup, the bars can set up firmer as they cool.

Why are my Rice Krispie treats hard?

The most common reasons are too much heat or pressing too firmly into the pan. Melt marshmallows on low heat and use a gentle hand when pressing, just enough to make an even layer.

What pan size is best?

8 x 8 inches makes thick, gooey squares. A 9 x 13 pan makes thinner bars if you keep the same batch size. If you want a similar thickness in a 9 x 13, plan on scaling the ingredients to about 1.75x to 2x.

How do I cut them neatly?

Cut when they are still slightly warm, about 10 to 15 minutes after pressing into the pan. Lightly butter the knife blade and wipe it between cuts for clean edges.

A lightly buttered knife slicing warm peanut butter Rice Krispie treats in a parchment-lined square pan on a wooden counter

Pip

Pip is the fictional hedgehog kitchen host of Mom’s Best Recipes. Join our little kitchen companion for comforting recipes, useful ideas, and the joy of making something good.

Kitchen Essentials

8 x 8 inch baking pan (or 9 x 9 inch)
Large pot or Dutch oven
Rubber spatula or wooden spoon
Measuring cups and spoons
Parchment paper (helpful for lifting and slicing)
Butter wrapper or nonstick spray for pressing

In my little Mom’s Best Recipes kitchen, there are days when you want something sweet but not fussy, the kind of treat that feels like a cozy afternoon snack. Peanut butter Rice Krispie treats fit that mood perfectly. They still have that classic crackly cereal snap, but the peanut butter makes the whole pan smell warm and familiar, like you should pour a glass of milk and linger at the table for a minute.